Martin Desruisseaux created SIS-429:
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Summary: Arithmetic operation on quantities on values converted to
system units
Key: SIS-429
URL: https://issues.apache.org/jira/browse/SIS-429
Project: Spatial Information Systems
Issue Type: Improvement
Reporter: Martin Desruisseaux
The result of arithmetic operations on quantities shall be as if all values
were converted to system quantities before the operations is performed. For
most units, it make no difference. But for temperature in Celsius, it as more
complex consequences (1°C + 2°C = 276.15 °C). While the above seems
counter-intuitive, it is essential for preserving arithmetic laws like
associativity and commutativity.
The more intuitive result (1°C + 2°C = 3°C) requires than one of the operand is
treated as a _temperature increment_ instead than a _temperature measurement_.
Such distinction is out of scope of the issue, since it would require a change
in Unit API.
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